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3. Turn off all power supply switches, starting with the DS4000 storage subsystem
Restoring power after an unexpected shutdown
Complete the following steps to restart the EXP810 if you turned off the power
supply switches during an emergency shutdown, or if a power failure or power
outage occurred:
1. After the emergency situation is over or power is restored, check the EXP810
2. After you check the EXP810 for damage, ensure that the power switches are in
3. Check the system documentation of the hardware devices that you want to turn
4. Turn on the power to each device, based on the startup sequence.
5. (Models with dc power supply and fan units only) Turn off power to any attached
6. The green LEDs on the front and the back of the EXP810 and DS4000 storage
first, and followed by the storage expansion enclosures. Then, unplug the power
cables from the EXP810.
CAUTION:
The power control button on the device and the power switch power
supply do not turn off the electrical current supplied to the device. The
device might also have more than one power cord. To remove all electrical
current from the device, ensure that all power cords are disconnected
from the power source.
for damage. If there is no visible damage, continue with step 2. Otherwise, have
your system serviced.
the off position; then plug in the EXP810 power cables, if required.
on and determine the proper startup sequence.
Note: Be sure to turn on all of the storage expansion enclosures and verify that
there are not any ESM or power supply and fan unit fault LEDs lit before
you turn on the DS4000 storage subsystem.
In addition, consider the following items:
v The storage subsystem supports simultaneous power-up of the system
components; however, you should always follow the power-up
sequence listed in the "Turning on the storage subsystem section" of
the appropriate DS4000 Storage Subsystem Installation, User's, and
Maintenance Guide during any attended power-up procedure.
v A storage subsystem in an optimal state should recover automatically
from an unexpected shutdown and unattended simultaneous
restoration of power to system components. After power is restored,
contact IBM technical support if any of the following conditions occur:
– The storage subsystem logical drives and subsystems do not
display in the DS Storage Manager graphical user interface (GUI).
– The storage subsystem logical drives and subsystems do not come
online.
– The storage subsystem logical drives and subsystems seem to be
degraded.
Note: All of the EXP810 storage expansion enclosures must be powered on
before the DS4000 storage subsystem.
disconnect devices.
subsystem should remain lit. If other amber Fault LEDs light, see "Solving
problems" on page 125.
Chapter 4. Operating the EXP810
83
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